A puppy arrives at the home of twelve-year-old Akari, who is trying to stay strong after her mother’s sudden illness. She instantly adores the puppy and names it “Socks” because its paws resemble white socks. Akari and Socks become inseparable, spending all their time together. However, as Akari matures, her attention shifts away from Socks. Over the years, they grow apart, and this emotional distance is mirrored by a physical one when Akari relocates to a distant city, leaving Socks in the care of a childhood friend. One day, Akari recalls the ten promises she made to Socks and her late mother…